Reciprocating engine



Nov. e, 1928. 1,690,126

W. NIELEBQCK RECIPROCATING ENGINE Filed Feb. 9, 1924 3 Sheets-Shet l 4TTOENE/S Nov. 6, 1928. 1,690,126

w. NIELEBOCK RECIPROCATING ENGINE Filed Feb. 9, 1924 J5 Sheets-Sheet 3mmma Patented Nov. 6, 1928.

f UNITED, STATES V 1,690,126 PATENT OFFICE.

a ms NIELEBOGK, or NOWAWES, NEAR BERLIN, GERMANY.

nncirnocarrme n'ivenvn.

Application fled February 9, 1824, Serial No. 691,814, and in GermanyFebruary 23, 1923.

.The invention relates to improvements in fluid controlsystems, and hasparticular reference to distribution valves for reciprocating doubleacting compound engines.

. An object of the invention is to insure a simple and reliable,reversal of the piston of the engine at the end of each stroke and theeasy accessibility of the distribution valves.

The improved distribution valve arrangement is particularly suitable forfeed and supply pumps. in \vhichthe driving medium has a compound actionand the cylinders are arranged in tandem, for compound air compressors,in which the cylinders are arranged side by side and also for singlecylinder engines. I

The control system according to the present invention ischaracterizedfby the feature that the auxiliaryslide valveis formed as apiston ivalve (as distinct from a stepped valve) having an extensionprojecting into the lower pressure cylinder, and is arranged to be movedin one direction by contact ofthe lower pressure piston with saidextension and 4 in the other'direction by motive fluid.

, As hereinafter more fully described, one side of the auxiliary valveis always exposed to the pressure of the high pressure cylinder, and aseparate passage serves to balance the pressureon both faces of theauxiliary valve and another separate passage serves to main 4 tain thepressure in the main valve chamber during the time that the port betweenthe high pressure cylinder and the other end of the auxiliary valvechest is closed by the high pressure piston. I

The drawings illustrate two embodiments of my invention.

Fig. 1 shows a section through the essential parts of the driving engineof a feed pump with the cylinders arranged in tandem.

Fig. 2 is a similar view of the high pressure steam side and the lowpressure air side of a com ound air compressor, the second piston set 0which is controlled by the common valve.

Fig. 3 is an enlarged fragmentary sectional view of the left-handportion of Fig. 2.

Similar parts are indicated by similar letters of reference throughoutall the figures of the drawings.

In the drawings a indicates the high pressure cylinder, 6 the lowpressure cylinder, and b, the cylinder of the air compressor (Fig. 2),c'the high pressure piston, d the low pressure piston, and d the lowpressure turn stroke.

air compressor piston (Fig. 2), e the auxiliary slide or distributionvalve, 7 the push rod which, in Figure 1, extends into the'low pressurecylinder, 9 and h passages for conducting the motive fluid throughchannel is to the dlstribution' chamber 0 of the main valve chest, 2'the pressure balancing or equaland the motive fluid has access to thechamber out the main valve chest, the auxiliary slide valve 6 havingbeen moved by said fluid into the position shown in thedrawings,whereupon the main valve p is moved to the. end position shown.Live steam or other motive fluid now enters behind the piston 0 throughthe passager, while the steam on the other side of the high pressurepiston acts through the passages'sgu, upon corresponding side of the lowpressure piston d or low pressure compressor piston (5, (Figs. 1 and 2),the

space in front of said piston then being open to exhausts through thepassages t, Q). When the new stroke begins the piston a closes the port9 and simultaneously uncovers the port It, so that the motive fluid athigh pressure reaches the distribution or main valve chamber 0 and themain slide valve retains its position until the low pressure piston d,or low pressure compressor piston al comes in contact with the extensionf at the other end of its stroke and shifts the auxiliary slide valve eso that the passages k and m are put into communication, the openedbalance passagei serving to retain the auxiliary valve in this position.The distribution chamber 0 is thereupon relieved of pressure and themain valve 7 is moved into its other end position. This change ofposition permits live motive fluid to enter the valve chest at z andfrom thence through the passage 8 into the upper end of the cylinder atto effect the re- At the end of the return stroke, owing to thedifierence of pressure on the two sides of the piston 0 after it haspassed the port 9, the auxiliary slide valve e is reversed by livemotive fluid entering the valve chest through said port. This completesthe cycle which is repeated so long as the engine is in operation.

It will be understood that I do not limit myself to the exactconstructions or arrange nents of the parts forming the improvediilistribution gear, but that these may be altered Within the ambit ofthe claims Without sacrificing any of the advantages of the invention.

\Vhat I claim as my invention and desire to secure by Letters Patent is:

1. In a fluid-controlled system for doubleacting reciprocating pistoncompound engines, the combination of a source of motive fluid, high andlow pressure cylinders, a high pressure piston in the high pressurecylinder, a lOW pressure piston in the other cylinder, an auxiliaryslide valve having an extension projeeting into said low pressurecylinder, said auxiliary slide valve being moved in one direction onlyby contact of said low pressure piston with said extension and in theother direction by motive fluid from said source, and a main valvecontrolled by the said auxiliary slide valve and distributing the fluidto the cylinders.

2. In a fluid-controlled system for doubleacting, reciprocating pistoncompound engines. the combination of a source of motive fluid high andlow pressure cylinders, a high pressure piston in the high pressurecylinder, a. 10W pressure piston in the other cylinder, an auxiliaryslide valve having an extension projecting into said low pressurecylinder, said auxiliary slide valve being moved in one direction onlyby contact of said low pressure piston with said extension and in theother direction by motive fluid from said source, there being a passagebetween said high pressure cy inder and one side of, said auxiliaryslide valve, which passage is controlled by said valve, and a main valvecontrolled by the said auxiliary slide valve and distributing the fiuidto the cylinders.

3. In a fluid-controlled system for doubleacting reciprocating pistoncompound engines, the combination of a source of niotivfi fluid. highand low pressure cylinders, a high pressure piston in the high pressurecylinder, a low pressure piston in the other cylinder, a maindistribution chamber, an auxiliary slide valve having; an extensionprojecting into said low pressure cylinder, said auxiliary slide valvebeing moved in one direction only by contact of said low pressure pistonwith said extension and in the other direction by motive fluid from saidsource, there being a passage between said high pressure cylinder andone side of said auxiliary slide valve. which passage is controlled bysaid valve, and there being other passages establishing communicationbetween said high pressure cylinder and the other side of said auxiliaryslide valve, one of which passages serves to maintain the pressure insaid main distribution chan'ibcr during the time that the other of saidpassages is closed by said high pressure piston, and a main valvecontrolled by the said auxiliary slide valve and distributing the fluidto the cylinders.

In testimony whereof I alfix my signature.

IVALTER NIELEBOCK.

